/// <summary>Creates the default method definition wrapped around the body
/// of the rule, which was generated by the caller. Returns <see cref="Basis"/>
/// with the specified new method body. If Basis is null, a simple default
/// method signature is used, e.g. <c>public void R() {...}</c> where R is
/// the rule name.</summary>
/// <param name="methodBody">The parsing code that was generated for this rule.</param>
/// <returns>A method.</returns>
public virtual LNode CreateRuleMethod(Rule rule, LNodeList methodBody)
{
LNode method = rule.GetMethodSignature();
var parts = method.Args.ToWList();
if (parts[0].IsIdNamed(S.Missing))
{
parts[0] = F.Id(rule.Name);
}
Debug.Assert(parts.Count == 3);
if (rule.IsRecognizer)
{
methodBody.Add(F.Call(S.Return, F.True));
}
parts.Add(F.OnNewLine(F.Braces(methodBody)));
return(method.WithArgs(parts.ToLNodeList()));
}
/// <summary>See <see cref="IPGCodeGenHelper.CreateTryWrapperForRecognizer"/> for more information.</summary>
public LNode CreateTryWrapperForRecognizer(Rule rule)
{
Debug.Assert(rule.TryWrapperName != null);
LNode method = rule.GetMethodSignature();
LNode retType = method.Args[0], name = method.Args[1], args = method.Args[2];
VList <LNode> forwardedArgs = ForwardedArgList(args);
LNode lookahead = F.Id("lookaheadAmt");
Debug.Assert(args.Calls(S.AltList));
args = args.WithArgs(args.Args.Insert(0, F.Var(F.Int32, lookahead)));
LNode savePosition = ApiType(F.Id(SavePosition));
LNode @this = InputSource ?? F.@this;
LNode body = F.Braces(
F.Call(S.UsingStmt, F.Call(S.New, F.Call(savePosition, @this, lookahead)),
F.Call(S.Return, F.Call(name, forwardedArgs)))
);
return(method.WithArgs(retType, rule.TryWrapperName, args, body));
}
/// <summary>See <see cref="IPGCodeGenHelper.CreateTryWrapperForRecognizer"/> for more information.</summary>
public LNode CreateTryWrapperForRecognizer(Rule rule)
{
Debug.Assert(rule.TryWrapperName != null);
LNode method = rule.GetMethodSignature();
LNode retType = method.Args[0], name = method.Args[1], args = method.Args[2];
RVList<LNode> forwardedArgs = ForwardedArgList(args);
LNode lookahead = F.Id("lookaheadAmt");
Debug.Assert(args.Calls(S.List));
args = args.WithArgs(args.Args.Insert(0, F.Var(F.Int32, lookahead)));
LNode savePosition = ApiType(F.Id(SavePosition));
LNode @this = InputSource ?? F.@this;
LNode body = F.Braces(
F.Call(S.UsingStmt, F.Call(S.New, F.Call(savePosition, @this, lookahead)),
F.Call(S.Return, F.Call(name, forwardedArgs)))
);
return method.WithArgs(retType, rule.TryWrapperName, args, body);
}